I use Tasmania to indicate this place did not yet exist in the then known world; Tasmania is less than 300 years old.

Although I am utterly unable to follow the gist of your argument, I would like to point out that this particular statement is inaccurate. The Tasman Basin contains glacial sedimentary and alluvial deposits (indicating it was above the water at least part of the time) dating from the Late Carboniferous - call it around 310 million years old. In other words, a bit over the 300 years you indicate.

Obviously, I referred to the name of a state called Tasmania did not exist, and this is correct. Captain Cook too did not exist!

Ah, I see (not!). Of course the province of Tasmania didn't exist. That seems a pretty trivial point. On the other hand, with reference to Noah et al, your deity would have had to know about the existence of the island of Tasmania, n'est-ce pas? Especially since old Noah would have had to take organisms like the thylacines and tasmanian devils (Sarcophilus harrisii) - none of which are/were found anywhere BUT Tasmania - with him on his boat, right?